高介电常数的聚合物基纳米复合电介质材料

高介电常数的聚合物基电介质材料无论是在电力工程,还是在微电子行业都具有十分重要的作用。研究中主要以聚偏氟乙烯(PVDF)为基体,以纳米和微米尺度的高介电常数的铁电陶瓷钛酸钡(BT)的前驱体粉末为功能添加组分,采用特殊的工艺制备了高介电常数的聚合物基纳米功能电介质复合材料。研究了制备工艺、添加物含量、以及微米/纳米BT的体积比等因素对复合电介质材料介电性能的影响。发现在无水乙醇中,通过纳米BT与PVDF颗粒之间强烈的吸附作用以及热模压工艺,可以制备高度分散性的BT/PVDF纳米复合材料。同时通过合理的组合微米/纳米BT的体积比,在BT同样的体积含量时,微米/纳米BT的共混物对复合材料介电性能的提高有明显协同效应。利用该效应可以制备介电常数高的聚合物基电介质材料。

Polymer-based Nanocomposite Dielectric Materials With High Dielectric Constant

High dielectric constant polymer-based diele-ctric materials are very important in electrical engineering and micro-electronics fields.In this study,high dielectric constant polymer-based nanocomposites consisting of polyvinylidene fluoride(PVDF)and ferroelectric BaTiO3(BT)powder were fabricated by using special processes.Effect of preparation process,BT concentration and the volume ratio(micron/nanom-eter)of BT on the dielectric property of the composites were studied.The homogenous BT/PVDF nanocomposites are prepared via a strong absorption action happened between the nanosized BT and PVDF particles in free-water ethanol solvent and subsequently a hot-press process.A synergistic effect for increasing the dielectric constant is discovered when the BT powders with micron and nanometer are filled into the PVDF.The result shows that the high dielectric constant polymer-based composites may be produced by means of the effect.